Smoke from prairie fires in Alberta and Saskatchewan, Canada (to the west of the areas pictured here), appears to be riding along with the prevailing winds and heading west across Manitoba (top left), Ontario (top right), and even dips down into Minnesota (bottom center), west of Lake Superior. This image was captured by MODIS on May 31, 2002. Sensor: Terra/MODIS. Data Start Date: 5/31/02. Data End Date: 5/31/02.